Robber threatens Melbourne Aldi worker with a knife

A supermarket worker has been threatened with a knife during a robbery in south-east Melbourne.

A man threatened the worker with a knife after walking into the Aldi shop at Carrums Down about 7.10pm Sunday, police said.

He demanded cash and then fled the shop on Frankston-Dandenong Road on foot.

CCTV footage of the robbery shows the man standing by the worker while brandishing a knife.

The worker then opens the till, and the robber later leaves the shop.

No one was hurt during the robbery, police said.

The man was wearing a black jacket with a hood, brown pants and distinctive red running shoes at the time of the robbery.

The police investigation is ongoing and detectives have appeal for witnesses to come forward.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000.